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تابش خورشیدی
Figure 6.3(a) (end view) depicts the transverse incidence angle (θT), which is the angle, measured in the X-Z plane, between the normal to the collector's surface and direct solar radiation.
Figure 6.3(b) (side view) depicts the longitudinal incidence angle (θL), which is the angle between the collector's normal and the solar radiation, but in the Y-Z plane.
The solar radiation reflectance of the MCT reflector ρr,sun was calculated by integrating the measured spectral reflectance ρλ,r (Figure 6.4) multiplied by the solar spectral irradiance Gλ,sun defined in ASTM G173-03 at 1.5 Air mass, and dividing the result by the solar total irradiance as shown in equation 6.2.
As the incidence angle of solar radiation onto the glass surface increases, the transmission decreases mainly through higher reflection losses.
The solar radiation reflectance of the MCT absorber tube was calculated by integrating the measured spectral reflectance (Figure 6.6) multiplied by the solar spectral irradiance defined in ASTM G173-03 at 1.5 Air mass, and dividing the result by the solar total irradiance using same equation.
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